This is what is known among serious hikers and campers as a three season sleeping bag. You can use it most of the year keeping warm through most of the spring, summer and fall - down to thirty five degrees Fahrenheit. This is type of bag for use cabins, cars and mild weather. It feature and inner lining made of taffeta with a strong honeycomb polyester shell. This sleeping bag has a pack weight of only 3.3 pounds and comes with a storage bag.